diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ea469475..c5e753085 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@
  * All contracts now have revert reason strings, which give insight into error conditions, and help debug failing transactions. ([#1704](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1704))
 
 ### Improvements:
- * Upgraded the minimum compiler version to v0.5.7: this prevents users from encountering compiler bugs that were fixed in this version. ([#1724](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1724))
+ * Reverted the Solidity version bump done in v2.2.0, setting the minimum compiler version to v0.5.0, to prevent unexpected build breakage. Users are encouraged however to stay on top of new compiler releases, which usually include bugfixes. ([#1728](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1728))
 
 ### Bugfixes:
  * `PostDeliveryCrowdsale`: some validations where skipped when paired with other crowdsale flavors, such as `AllowanceCrowdsale`, or `MintableCrowdsale` and `ERC20Capped`, which could cause buyers to not be able to claim their purchased tokens. ([#1721](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1721))
diff --git a/contracts/access/Roles.sol b/contracts/access/Roles.sol
index 25da77e28..5f3eff6ae 100644
--- a/contracts/access/Roles.sol
+++ b/contracts/access/Roles.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Roles
diff --git a/contracts/access/roles/CapperRole.sol b/contracts/access/roles/CapperRole.sol
index 527097d8b..7c1af8a8c 100644
--- a/contracts/access/roles/CapperRole.sol
+++ b/contracts/access/roles/CapperRole.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 
diff --git a/contracts/access/roles/MinterRole.sol b/contracts/access/roles/MinterRole.sol
index fd44a7fb7..a84367cf3 100644
--- a/contracts/access/roles/MinterRole.sol
+++ b/contracts/access/roles/MinterRole.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 
diff --git a/contracts/access/roles/PauserRole.sol b/contracts/access/roles/PauserRole.sol
index 1f94c3908..f149139aa 100644
--- a/contracts/access/roles/PauserRole.sol
+++ b/contracts/access/roles/PauserRole.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 
diff --git a/contracts/access/roles/SignerRole.sol b/contracts/access/roles/SignerRole.sol
index 0e5e4425d..468d0aef1 100644
--- a/contracts/access/roles/SignerRole.sol
+++ b/contracts/access/roles/SignerRole.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 
diff --git a/contracts/access/roles/WhitelistAdminRole.sol b/contracts/access/roles/WhitelistAdminRole.sol
index d7283cbc0..8c16928fe 100644
--- a/contracts/access/roles/WhitelistAdminRole.sol
+++ b/contracts/access/roles/WhitelistAdminRole.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 
diff --git a/contracts/access/roles/WhitelistedRole.sol b/contracts/access/roles/WhitelistedRole.sol
index cca313794..326d3343a 100644
--- a/contracts/access/roles/WhitelistedRole.sol
+++ b/contracts/access/roles/WhitelistedRole.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 import "./WhitelistAdminRole.sol";
diff --git a/contracts/crowdsale/Crowdsale.sol b/contracts/crowdsale/Crowdsale.sol
index e9857ab56..824ba83cf 100644
--- a/contracts/crowdsale/Crowdsale.sol
+++ b/contracts/crowdsale/Crowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../math/SafeMath.sol";
diff --git a/contracts/crowdsale/distribution/FinalizableCrowdsale.sol b/contracts/crowdsale/distribution/FinalizableCrowdsale.sol
index a3c3fdd2a..9c42e6146 100644
--- a/contracts/crowdsale/distribution/FinalizableCrowdsale.sol
+++ b/contracts/crowdsale/distribution/FinalizableCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../validation/TimedCrowdsale.sol";
diff --git a/contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol b/contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol
index c10677545..41b9059b7 100644
--- a/contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol
+++ b/contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../validation/TimedCrowdsale.sol";
 import "../../math/SafeMath.sol";
diff --git a/contracts/crowdsale/distribution/RefundableCrowdsale.sol b/contracts/crowdsale/distribution/RefundableCrowdsale.sol
index e6af3b69d..7502f69bf 100644
--- a/contracts/crowdsale/distribution/RefundableCrowdsale.sol
+++ b/contracts/crowdsale/distribution/RefundableCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "./FinalizableCrowdsale.sol";
diff --git a/contracts/crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol b/contracts/crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol
index 7fcd68565..385aa195c 100644
--- a/contracts/crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol
+++ b/contracts/crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./RefundableCrowdsale.sol";
 import "./PostDeliveryCrowdsale.sol";
diff --git a/contracts/crowdsale/emission/AllowanceCrowdsale.sol b/contracts/crowdsale/emission/AllowanceCrowdsale.sol
index cc9eaff68..beee692a6 100644
--- a/contracts/crowdsale/emission/AllowanceCrowdsale.sol
+++ b/contracts/crowdsale/emission/AllowanceCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Crowdsale.sol";
 import "../../token/ERC20/IERC20.sol";
diff --git a/contracts/crowdsale/emission/MintedCrowdsale.sol b/contracts/crowdsale/emission/MintedCrowdsale.sol
index fe4567154..7815b8cac 100644
--- a/contracts/crowdsale/emission/MintedCrowdsale.sol
+++ b/contracts/crowdsale/emission/MintedCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Crowdsale.sol";
 import "../../token/ERC20/ERC20Mintable.sol";
diff --git a/contracts/crowdsale/price/IncreasingPriceCrowdsale.sol b/contracts/crowdsale/price/IncreasingPriceCrowdsale.sol
index 75834b7f1..964514ba2 100644
--- a/contracts/crowdsale/price/IncreasingPriceCrowdsale.sol
+++ b/contracts/crowdsale/price/IncreasingPriceCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../validation/TimedCrowdsale.sol";
 import "../../math/SafeMath.sol";
diff --git a/contracts/crowdsale/validation/CappedCrowdsale.sol b/contracts/crowdsale/validation/CappedCrowdsale.sol
index 44293d48b..e8aeede14 100644
--- a/contracts/crowdsale/validation/CappedCrowdsale.sol
+++ b/contracts/crowdsale/validation/CappedCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../Crowdsale.sol";
diff --git a/contracts/crowdsale/validation/IndividuallyCappedCrowdsale.sol b/contracts/crowdsale/validation/IndividuallyCappedCrowdsale.sol
index 8dbcd0ee4..1f9df361d 100644
--- a/contracts/crowdsale/validation/IndividuallyCappedCrowdsale.sol
+++ b/contracts/crowdsale/validation/IndividuallyCappedCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../Crowdsale.sol";
diff --git a/contracts/crowdsale/validation/PausableCrowdsale.sol b/contracts/crowdsale/validation/PausableCrowdsale.sol
index 673684e0d..cc89aebab 100644
--- a/contracts/crowdsale/validation/PausableCrowdsale.sol
+++ b/contracts/crowdsale/validation/PausableCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Crowdsale.sol";
 import "../../lifecycle/Pausable.sol";
diff --git a/contracts/crowdsale/validation/TimedCrowdsale.sol b/contracts/crowdsale/validation/TimedCrowdsale.sol
index a88548619..255a63f34 100644
--- a/contracts/crowdsale/validation/TimedCrowdsale.sol
+++ b/contracts/crowdsale/validation/TimedCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../Crowdsale.sol";
diff --git a/contracts/crowdsale/validation/WhitelistCrowdsale.sol b/contracts/crowdsale/validation/WhitelistCrowdsale.sol
index 8cdd478a4..0f5965352 100644
--- a/contracts/crowdsale/validation/WhitelistCrowdsale.sol
+++ b/contracts/crowdsale/validation/WhitelistCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 import "../Crowdsale.sol";
 import "../../access/roles/WhitelistedRole.sol";
 
diff --git a/contracts/cryptography/ECDSA.sol b/contracts/cryptography/ECDSA.sol
index eca3dfa95..c54fe6a56 100644
--- a/contracts/cryptography/ECDSA.sol
+++ b/contracts/cryptography/ECDSA.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Elliptic curve signature operations
diff --git a/contracts/cryptography/MerkleProof.sol b/contracts/cryptography/MerkleProof.sol
index 702916c72..2a964c8ba 100644
--- a/contracts/cryptography/MerkleProof.sol
+++ b/contracts/cryptography/MerkleProof.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title MerkleProof
diff --git a/contracts/drafts/Counters.sol b/contracts/drafts/Counters.sol
index 0ebf221e2..2d4db92b8 100644
--- a/contracts/drafts/Counters.sol
+++ b/contracts/drafts/Counters.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 
diff --git a/contracts/drafts/ERC1046/ERC20Metadata.sol b/contracts/drafts/ERC1046/ERC20Metadata.sol
index 0960dc683..b42181650 100644
--- a/contracts/drafts/ERC1046/ERC20Metadata.sol
+++ b/contracts/drafts/ERC1046/ERC20Metadata.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../token/ERC20/IERC20.sol";
 
diff --git a/contracts/drafts/ERC1820Implementer.sol b/contracts/drafts/ERC1820Implementer.sol
index a0e7abfe6..48746a7ce 100644
--- a/contracts/drafts/ERC1820Implementer.sol
+++ b/contracts/drafts/ERC1820Implementer.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC1820Implementer.sol";
 
diff --git a/contracts/drafts/ERC20Migrator.sol b/contracts/drafts/ERC20Migrator.sol
index f0daf9087..9c6a65d65 100644
--- a/contracts/drafts/ERC20Migrator.sol
+++ b/contracts/drafts/ERC20Migrator.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../token/ERC20/ERC20Mintable.sol";
diff --git a/contracts/drafts/ERC20Snapshot.sol b/contracts/drafts/ERC20Snapshot.sol
index f226a2037..597fd2fbf 100644
--- a/contracts/drafts/ERC20Snapshot.sol
+++ b/contracts/drafts/ERC20Snapshot.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 import "../utils/Arrays.sol";
diff --git a/contracts/drafts/ERC777/ERC777.sol b/contracts/drafts/ERC777/ERC777.sol
index a56a91266..80609666b 100644
--- a/contracts/drafts/ERC777/ERC777.sol
+++ b/contracts/drafts/ERC777/ERC777.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC777.sol";
 import "./IERC777Recipient.sol";
diff --git a/contracts/drafts/ERC777/IERC777.sol b/contracts/drafts/ERC777/IERC777.sol
index 29778c08d..1f85d22ce 100644
--- a/contracts/drafts/ERC777/IERC777.sol
+++ b/contracts/drafts/ERC777/IERC777.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC777 token interface
diff --git a/contracts/drafts/ERC777/IERC777Recipient.sol b/contracts/drafts/ERC777/IERC777Recipient.sol
index 752c96fe7..01429c2af 100644
--- a/contracts/drafts/ERC777/IERC777Recipient.sol
+++ b/contracts/drafts/ERC777/IERC777Recipient.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC777 token recipient interface
diff --git a/contracts/drafts/ERC777/IERC777Sender.sol b/contracts/drafts/ERC777/IERC777Sender.sol
index 89ae7e3e6..d9a8421a9 100644
--- a/contracts/drafts/ERC777/IERC777Sender.sol
+++ b/contracts/drafts/ERC777/IERC777Sender.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC777 token sender interface
diff --git a/contracts/drafts/IERC1820Implementer.sol b/contracts/drafts/IERC1820Implementer.sol
index 234c76989..eb4e7eaea 100644
--- a/contracts/drafts/IERC1820Implementer.sol
+++ b/contracts/drafts/IERC1820Implementer.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title IERC1820Implementer
diff --git a/contracts/drafts/IERC1820Registry.sol b/contracts/drafts/IERC1820Registry.sol
index c07e34b14..a979f79d9 100644
--- a/contracts/drafts/IERC1820Registry.sol
+++ b/contracts/drafts/IERC1820Registry.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC1820 Pseudo-introspection Registry Contract
diff --git a/contracts/drafts/SignatureBouncer.sol b/contracts/drafts/SignatureBouncer.sol
index 5564e117b..b3c9304f6 100644
--- a/contracts/drafts/SignatureBouncer.sol
+++ b/contracts/drafts/SignatureBouncer.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/SignerRole.sol";
 import "../cryptography/ECDSA.sol";
diff --git a/contracts/drafts/SignedSafeMath.sol b/contracts/drafts/SignedSafeMath.sol
index 808bd563e..95a68df0a 100644
--- a/contracts/drafts/SignedSafeMath.sol
+++ b/contracts/drafts/SignedSafeMath.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title SignedSafeMath
diff --git a/contracts/drafts/TokenVesting.sol b/contracts/drafts/TokenVesting.sol
index 951895d5e..626db459d 100644
--- a/contracts/drafts/TokenVesting.sol
+++ b/contracts/drafts/TokenVesting.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/SafeERC20.sol";
 import "../ownership/Ownable.sol";
diff --git a/contracts/examples/SampleCrowdsale.sol b/contracts/examples/SampleCrowdsale.sol
index 1d8d65ee5..fefed16fc 100644
--- a/contracts/examples/SampleCrowdsale.sol
+++ b/contracts/examples/SampleCrowdsale.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../crowdsale/validation/CappedCrowdsale.sol";
 import "../crowdsale/distribution/RefundableCrowdsale.sol";
diff --git a/contracts/examples/SimpleToken.sol b/contracts/examples/SimpleToken.sol
index f5e59a4b5..50a4f433f 100644
--- a/contracts/examples/SimpleToken.sol
+++ b/contracts/examples/SimpleToken.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../token/ERC20/ERC20Detailed.sol";
diff --git a/contracts/introspection/ERC165.sol b/contracts/introspection/ERC165.sol
index 4765f83fa..05feab5bc 100644
--- a/contracts/introspection/ERC165.sol
+++ b/contracts/introspection/ERC165.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC165.sol";
 
diff --git a/contracts/introspection/ERC165Checker.sol b/contracts/introspection/ERC165Checker.sol
index 1dea5cb27..a569b46c5 100644
--- a/contracts/introspection/ERC165Checker.sol
+++ b/contracts/introspection/ERC165Checker.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC165Checker
diff --git a/contracts/introspection/IERC165.sol b/contracts/introspection/IERC165.sol
index 373058db6..c5e90e6a1 100644
--- a/contracts/introspection/IERC165.sol
+++ b/contracts/introspection/IERC165.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title IERC165
diff --git a/contracts/lifecycle/Pausable.sol b/contracts/lifecycle/Pausable.sol
index 8cbb3e8cd..f9656f8ef 100644
--- a/contracts/lifecycle/Pausable.sol
+++ b/contracts/lifecycle/Pausable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/PauserRole.sol";
 
diff --git a/contracts/math/Math.sol b/contracts/math/Math.sol
index 9a9e4cb2a..f50e874c1 100644
--- a/contracts/math/Math.sol
+++ b/contracts/math/Math.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Math
diff --git a/contracts/math/SafeMath.sol b/contracts/math/SafeMath.sol
index 8e5d7bd6f..56076405f 100644
--- a/contracts/math/SafeMath.sol
+++ b/contracts/math/SafeMath.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title SafeMath
diff --git a/contracts/mocks/AddressImpl.sol b/contracts/mocks/AddressImpl.sol
index 07fd1c066..a73591c37 100644
--- a/contracts/mocks/AddressImpl.sol
+++ b/contracts/mocks/AddressImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../utils/Address.sol";
 
diff --git a/contracts/mocks/AllowanceCrowdsaleImpl.sol b/contracts/mocks/AllowanceCrowdsaleImpl.sol
index 97d8b5200..9c6fdb511 100644
--- a/contracts/mocks/AllowanceCrowdsaleImpl.sol
+++ b/contracts/mocks/AllowanceCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/emission/AllowanceCrowdsale.sol";
diff --git a/contracts/mocks/ArraysImpl.sol b/contracts/mocks/ArraysImpl.sol
index ab3ff72cb..b2067526d 100644
--- a/contracts/mocks/ArraysImpl.sol
+++ b/contracts/mocks/ArraysImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../utils/Arrays.sol";
 
diff --git a/contracts/mocks/CappedCrowdsaleImpl.sol b/contracts/mocks/CappedCrowdsaleImpl.sol
index 1f62fe10f..d0c59db4c 100644
--- a/contracts/mocks/CappedCrowdsaleImpl.sol
+++ b/contracts/mocks/CappedCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/CappedCrowdsale.sol";
diff --git a/contracts/mocks/CapperRoleMock.sol b/contracts/mocks/CapperRoleMock.sol
index 5189d7ab9..0090d1ff6 100644
--- a/contracts/mocks/CapperRoleMock.sol
+++ b/contracts/mocks/CapperRoleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/CapperRole.sol";
 
diff --git a/contracts/mocks/ConditionalEscrowMock.sol b/contracts/mocks/ConditionalEscrowMock.sol
index 1dcbab927..4b39ba386 100644
--- a/contracts/mocks/ConditionalEscrowMock.sol
+++ b/contracts/mocks/ConditionalEscrowMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../payment/escrow/ConditionalEscrow.sol";
 
diff --git a/contracts/mocks/CountersImpl.sol b/contracts/mocks/CountersImpl.sol
index ef4a7392b..cc53139f7 100644
--- a/contracts/mocks/CountersImpl.sol
+++ b/contracts/mocks/CountersImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/Counters.sol";
 
diff --git a/contracts/mocks/CrowdsaleMock.sol b/contracts/mocks/CrowdsaleMock.sol
index d3f955d32..6dafa4b7e 100644
--- a/contracts/mocks/CrowdsaleMock.sol
+++ b/contracts/mocks/CrowdsaleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../crowdsale/Crowdsale.sol";
 
diff --git a/contracts/mocks/ECDSAMock.sol b/contracts/mocks/ECDSAMock.sol
index babec0f8c..977f324ac 100644
--- a/contracts/mocks/ECDSAMock.sol
+++ b/contracts/mocks/ECDSAMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../cryptography/ECDSA.sol";
 
diff --git a/contracts/mocks/ERC165/ERC165InterfacesSupported.sol b/contracts/mocks/ERC165/ERC165InterfacesSupported.sol
index 40c74b020..ab4d5a5df 100644
--- a/contracts/mocks/ERC165/ERC165InterfacesSupported.sol
+++ b/contracts/mocks/ERC165/ERC165InterfacesSupported.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../introspection/IERC165.sol";
 
diff --git a/contracts/mocks/ERC165/ERC165NotSupported.sol b/contracts/mocks/ERC165/ERC165NotSupported.sol
index 833c2ad9b..d154da33e 100644
--- a/contracts/mocks/ERC165/ERC165NotSupported.sol
+++ b/contracts/mocks/ERC165/ERC165NotSupported.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 contract ERC165NotSupported {
     // solhint-disable-previous-line no-empty-blocks
diff --git a/contracts/mocks/ERC165CheckerMock.sol b/contracts/mocks/ERC165CheckerMock.sol
index fb64c72a1..db1853de0 100644
--- a/contracts/mocks/ERC165CheckerMock.sol
+++ b/contracts/mocks/ERC165CheckerMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../introspection/ERC165Checker.sol";
 
diff --git a/contracts/mocks/ERC165Mock.sol b/contracts/mocks/ERC165Mock.sol
index b6adec9ca..e21581b52 100644
--- a/contracts/mocks/ERC165Mock.sol
+++ b/contracts/mocks/ERC165Mock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../introspection/ERC165.sol";
 
diff --git a/contracts/mocks/ERC1820ImplementerMock.sol b/contracts/mocks/ERC1820ImplementerMock.sol
index 50996ea3c..94f1db951 100644
--- a/contracts/mocks/ERC1820ImplementerMock.sol
+++ b/contracts/mocks/ERC1820ImplementerMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC1820Implementer.sol";
 
diff --git a/contracts/mocks/ERC20BurnableMock.sol b/contracts/mocks/ERC20BurnableMock.sol
index 37e771bb6..20db0b9a4 100644
--- a/contracts/mocks/ERC20BurnableMock.sol
+++ b/contracts/mocks/ERC20BurnableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Burnable.sol";
 
diff --git a/contracts/mocks/ERC20DetailedMock.sol b/contracts/mocks/ERC20DetailedMock.sol
index 469fd4c28..f2761b348 100644
--- a/contracts/mocks/ERC20DetailedMock.sol
+++ b/contracts/mocks/ERC20DetailedMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../token/ERC20/ERC20Detailed.sol";
diff --git a/contracts/mocks/ERC20MetadataMock.sol b/contracts/mocks/ERC20MetadataMock.sol
index 9bae3c70b..9807cc4ae 100644
--- a/contracts/mocks/ERC20MetadataMock.sol
+++ b/contracts/mocks/ERC20MetadataMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../drafts/ERC1046/ERC20Metadata.sol";
diff --git a/contracts/mocks/ERC20MintableMock.sol b/contracts/mocks/ERC20MintableMock.sol
index 34a57d2f6..3ea65ef62 100644
--- a/contracts/mocks/ERC20MintableMock.sol
+++ b/contracts/mocks/ERC20MintableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Mintable.sol";
 import "./MinterRoleMock.sol";
diff --git a/contracts/mocks/ERC20Mock.sol b/contracts/mocks/ERC20Mock.sol
index eb5c0112b..b5ed2fc7e 100644
--- a/contracts/mocks/ERC20Mock.sol
+++ b/contracts/mocks/ERC20Mock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 
diff --git a/contracts/mocks/ERC20PausableMock.sol b/contracts/mocks/ERC20PausableMock.sol
index db7f8b348..4c9cdb7f8 100644
--- a/contracts/mocks/ERC20PausableMock.sol
+++ b/contracts/mocks/ERC20PausableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Pausable.sol";
 import "./PauserRoleMock.sol";
diff --git a/contracts/mocks/ERC20SnapshotMock.sol b/contracts/mocks/ERC20SnapshotMock.sol
index e0f9668fd..a877a9209 100644
--- a/contracts/mocks/ERC20SnapshotMock.sol
+++ b/contracts/mocks/ERC20SnapshotMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC20Snapshot.sol";
 
diff --git a/contracts/mocks/ERC721FullMock.sol b/contracts/mocks/ERC721FullMock.sol
index 8a41ab329..b0f00918b 100644
--- a/contracts/mocks/ERC721FullMock.sol
+++ b/contracts/mocks/ERC721FullMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721Full.sol";
 import "../token/ERC721/ERC721Mintable.sol";
diff --git a/contracts/mocks/ERC721MintableBurnableImpl.sol b/contracts/mocks/ERC721MintableBurnableImpl.sol
index 6fe33a123..fcb692723 100644
--- a/contracts/mocks/ERC721MintableBurnableImpl.sol
+++ b/contracts/mocks/ERC721MintableBurnableImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721Full.sol";
 import "../token/ERC721/ERC721Mintable.sol";
diff --git a/contracts/mocks/ERC721Mock.sol b/contracts/mocks/ERC721Mock.sol
index ded7b0f7b..b02df5d21 100644
--- a/contracts/mocks/ERC721Mock.sol
+++ b/contracts/mocks/ERC721Mock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721.sol";
 
diff --git a/contracts/mocks/ERC721PausableMock.sol b/contracts/mocks/ERC721PausableMock.sol
index 1d03a5e22..f46f9e776 100644
--- a/contracts/mocks/ERC721PausableMock.sol
+++ b/contracts/mocks/ERC721PausableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721Pausable.sol";
 import "./PauserRoleMock.sol";
diff --git a/contracts/mocks/ERC721ReceiverMock.sol b/contracts/mocks/ERC721ReceiverMock.sol
index 07f5d204b..a0932eca6 100644
--- a/contracts/mocks/ERC721ReceiverMock.sol
+++ b/contracts/mocks/ERC721ReceiverMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/IERC721Receiver.sol";
 
diff --git a/contracts/mocks/ERC777Mock.sol b/contracts/mocks/ERC777Mock.sol
index 232117dd2..30657ca2e 100644
--- a/contracts/mocks/ERC777Mock.sol
+++ b/contracts/mocks/ERC777Mock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC777/ERC777.sol";
 
diff --git a/contracts/mocks/ERC777SenderRecipientMock.sol b/contracts/mocks/ERC777SenderRecipientMock.sol
index 08bac0fc7..abebfc6e2 100644
--- a/contracts/mocks/ERC777SenderRecipientMock.sol
+++ b/contracts/mocks/ERC777SenderRecipientMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC777/IERC777.sol";
 import "../drafts/ERC777/IERC777Sender.sol";
diff --git a/contracts/mocks/FinalizableCrowdsaleImpl.sol b/contracts/mocks/FinalizableCrowdsaleImpl.sol
index 204c58507..99f7a255d 100644
--- a/contracts/mocks/FinalizableCrowdsaleImpl.sol
+++ b/contracts/mocks/FinalizableCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/FinalizableCrowdsale.sol";
diff --git a/contracts/mocks/IncreasingPriceCrowdsaleImpl.sol b/contracts/mocks/IncreasingPriceCrowdsaleImpl.sol
index 5b43e40b2..c5b0e7957 100644
--- a/contracts/mocks/IncreasingPriceCrowdsaleImpl.sol
+++ b/contracts/mocks/IncreasingPriceCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../crowdsale/price/IncreasingPriceCrowdsale.sol";
 import "../math/SafeMath.sol";
diff --git a/contracts/mocks/IndividuallyCappedCrowdsaleImpl.sol b/contracts/mocks/IndividuallyCappedCrowdsaleImpl.sol
index 0f531971d..43b0366ee 100644
--- a/contracts/mocks/IndividuallyCappedCrowdsaleImpl.sol
+++ b/contracts/mocks/IndividuallyCappedCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/IndividuallyCappedCrowdsale.sol";
diff --git a/contracts/mocks/MathMock.sol b/contracts/mocks/MathMock.sol
index 869a2c5c2..2461fe902 100644
--- a/contracts/mocks/MathMock.sol
+++ b/contracts/mocks/MathMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/Math.sol";
 
diff --git a/contracts/mocks/MerkleProofWrapper.sol b/contracts/mocks/MerkleProofWrapper.sol
index 8b09affd7..23c72b269 100644
--- a/contracts/mocks/MerkleProofWrapper.sol
+++ b/contracts/mocks/MerkleProofWrapper.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import { MerkleProof } from "../cryptography/MerkleProof.sol";
 
diff --git a/contracts/mocks/MintedCrowdsaleImpl.sol b/contracts/mocks/MintedCrowdsaleImpl.sol
index f0465b3a6..22f4d36c0 100644
--- a/contracts/mocks/MintedCrowdsaleImpl.sol
+++ b/contracts/mocks/MintedCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Mintable.sol";
 import "../crowdsale/emission/MintedCrowdsale.sol";
diff --git a/contracts/mocks/MinterRoleMock.sol b/contracts/mocks/MinterRoleMock.sol
index 55f060880..4b0401d87 100644
--- a/contracts/mocks/MinterRoleMock.sol
+++ b/contracts/mocks/MinterRoleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/MinterRole.sol";
 
diff --git a/contracts/mocks/OwnableInterfaceId.sol b/contracts/mocks/OwnableInterfaceId.sol
index 49b56382b..996ab88e9 100644
--- a/contracts/mocks/OwnableInterfaceId.sol
+++ b/contracts/mocks/OwnableInterfaceId.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../ownership/Ownable.sol";
 
diff --git a/contracts/mocks/OwnableMock.sol b/contracts/mocks/OwnableMock.sol
index 3e0c7281e..c7b1cf5c7 100644
--- a/contracts/mocks/OwnableMock.sol
+++ b/contracts/mocks/OwnableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../ownership/Ownable.sol";
 
diff --git a/contracts/mocks/PausableCrowdsaleImpl.sol b/contracts/mocks/PausableCrowdsaleImpl.sol
index 237ea7fd9..11f44c7b8 100644
--- a/contracts/mocks/PausableCrowdsaleImpl.sol
+++ b/contracts/mocks/PausableCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../crowdsale/validation/PausableCrowdsale.sol";
diff --git a/contracts/mocks/PausableMock.sol b/contracts/mocks/PausableMock.sol
index a9e9d58df..8e9ae03d3 100644
--- a/contracts/mocks/PausableMock.sol
+++ b/contracts/mocks/PausableMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../lifecycle/Pausable.sol";
 import "./PauserRoleMock.sol";
diff --git a/contracts/mocks/PauserRoleMock.sol b/contracts/mocks/PauserRoleMock.sol
index 67fc61019..fc2ed16d9 100644
--- a/contracts/mocks/PauserRoleMock.sol
+++ b/contracts/mocks/PauserRoleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/PauserRole.sol";
 
diff --git a/contracts/mocks/PostDeliveryCrowdsaleImpl.sol b/contracts/mocks/PostDeliveryCrowdsaleImpl.sol
index bbc08aef0..efb67c084 100644
--- a/contracts/mocks/PostDeliveryCrowdsaleImpl.sol
+++ b/contracts/mocks/PostDeliveryCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/PostDeliveryCrowdsale.sol";
diff --git a/contracts/mocks/PullPaymentMock.sol b/contracts/mocks/PullPaymentMock.sol
index 9e7180f1f..1a26b6242 100644
--- a/contracts/mocks/PullPaymentMock.sol
+++ b/contracts/mocks/PullPaymentMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../payment/PullPayment.sol";
 
diff --git a/contracts/mocks/ReentrancyAttack.sol b/contracts/mocks/ReentrancyAttack.sol
index e9fbebecf..09d52a260 100644
--- a/contracts/mocks/ReentrancyAttack.sol
+++ b/contracts/mocks/ReentrancyAttack.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 contract ReentrancyAttack {
     function callSender(bytes4 data) public {
diff --git a/contracts/mocks/ReentrancyMock.sol b/contracts/mocks/ReentrancyMock.sol
index 20eaa8739..50233287d 100644
--- a/contracts/mocks/ReentrancyMock.sol
+++ b/contracts/mocks/ReentrancyMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../utils/ReentrancyGuard.sol";
 import "./ReentrancyAttack.sol";
diff --git a/contracts/mocks/RefundableCrowdsaleImpl.sol b/contracts/mocks/RefundableCrowdsaleImpl.sol
index 16da92229..5ed5d1ed5 100644
--- a/contracts/mocks/RefundableCrowdsaleImpl.sol
+++ b/contracts/mocks/RefundableCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/RefundableCrowdsale.sol";
diff --git a/contracts/mocks/RefundablePostDeliveryCrowdsaleImpl.sol b/contracts/mocks/RefundablePostDeliveryCrowdsaleImpl.sol
index aff64e7f5..b81f0757c 100644
--- a/contracts/mocks/RefundablePostDeliveryCrowdsaleImpl.sol
+++ b/contracts/mocks/RefundablePostDeliveryCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol";
diff --git a/contracts/mocks/RolesMock.sol b/contracts/mocks/RolesMock.sol
index ab8bf3628..4b0f0de0a 100644
--- a/contracts/mocks/RolesMock.sol
+++ b/contracts/mocks/RolesMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/Roles.sol";
 
diff --git a/contracts/mocks/SafeERC20Helper.sol b/contracts/mocks/SafeERC20Helper.sol
index 6d77d8030..b36dc35a7 100644
--- a/contracts/mocks/SafeERC20Helper.sol
+++ b/contracts/mocks/SafeERC20Helper.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../token/ERC20/SafeERC20.sol";
diff --git a/contracts/mocks/SafeMathMock.sol b/contracts/mocks/SafeMathMock.sol
index abfdf3eb5..43dac5ec2 100644
--- a/contracts/mocks/SafeMathMock.sol
+++ b/contracts/mocks/SafeMathMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 
diff --git a/contracts/mocks/SecondaryMock.sol b/contracts/mocks/SecondaryMock.sol
index 69f3a57cd..1ff45b11e 100644
--- a/contracts/mocks/SecondaryMock.sol
+++ b/contracts/mocks/SecondaryMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../ownership/Secondary.sol";
 
diff --git a/contracts/mocks/SignatureBouncerMock.sol b/contracts/mocks/SignatureBouncerMock.sol
index 6c1e17ad4..59c59b437 100644
--- a/contracts/mocks/SignatureBouncerMock.sol
+++ b/contracts/mocks/SignatureBouncerMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/SignatureBouncer.sol";
 import "./SignerRoleMock.sol";
diff --git a/contracts/mocks/SignedSafeMathMock.sol b/contracts/mocks/SignedSafeMathMock.sol
index fe096222a..90a3ee642 100644
--- a/contracts/mocks/SignedSafeMathMock.sol
+++ b/contracts/mocks/SignedSafeMathMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/SignedSafeMath.sol";
 
diff --git a/contracts/mocks/SignerRoleMock.sol b/contracts/mocks/SignerRoleMock.sol
index 06e782b6b..71b4c792a 100644
--- a/contracts/mocks/SignerRoleMock.sol
+++ b/contracts/mocks/SignerRoleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/SignerRole.sol";
 
diff --git a/contracts/mocks/TimedCrowdsaleImpl.sol b/contracts/mocks/TimedCrowdsaleImpl.sol
index 7cae42acf..b85817c77 100644
--- a/contracts/mocks/TimedCrowdsaleImpl.sol
+++ b/contracts/mocks/TimedCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/TimedCrowdsale.sol";
diff --git a/contracts/mocks/WhitelistAdminRoleMock.sol b/contracts/mocks/WhitelistAdminRoleMock.sol
index 332c5acfa..7a267ca21 100644
--- a/contracts/mocks/WhitelistAdminRoleMock.sol
+++ b/contracts/mocks/WhitelistAdminRoleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/WhitelistAdminRole.sol";
 
diff --git a/contracts/mocks/WhitelistCrowdsaleImpl.sol b/contracts/mocks/WhitelistCrowdsaleImpl.sol
index dc02d2255..0200f7f7f 100644
--- a/contracts/mocks/WhitelistCrowdsaleImpl.sol
+++ b/contracts/mocks/WhitelistCrowdsaleImpl.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/WhitelistCrowdsale.sol";
diff --git a/contracts/mocks/WhitelistedRoleMock.sol b/contracts/mocks/WhitelistedRoleMock.sol
index c9b45b3fa..7f7c89412 100644
--- a/contracts/mocks/WhitelistedRoleMock.sol
+++ b/contracts/mocks/WhitelistedRoleMock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/WhitelistedRole.sol";
 
diff --git a/contracts/ownership/Ownable.sol b/contracts/ownership/Ownable.sol
index c03fa2c26..5b402cacd 100644
--- a/contracts/ownership/Ownable.sol
+++ b/contracts/ownership/Ownable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Ownable
diff --git a/contracts/ownership/Secondary.sol b/contracts/ownership/Secondary.sol
index 49784989d..d7342969d 100644
--- a/contracts/ownership/Secondary.sol
+++ b/contracts/ownership/Secondary.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Secondary
diff --git a/contracts/payment/PaymentSplitter.sol b/contracts/payment/PaymentSplitter.sol
index cbf142293..706440448 100644
--- a/contracts/payment/PaymentSplitter.sol
+++ b/contracts/payment/PaymentSplitter.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 
diff --git a/contracts/payment/PullPayment.sol b/contracts/payment/PullPayment.sol
index 0975f80d5..9e326514b 100644
--- a/contracts/payment/PullPayment.sol
+++ b/contracts/payment/PullPayment.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./escrow/Escrow.sol";
 
diff --git a/contracts/payment/escrow/ConditionalEscrow.sol b/contracts/payment/escrow/ConditionalEscrow.sol
index 96a2a0139..0cbe8f044 100644
--- a/contracts/payment/escrow/ConditionalEscrow.sol
+++ b/contracts/payment/escrow/ConditionalEscrow.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./Escrow.sol";
 
diff --git a/contracts/payment/escrow/Escrow.sol b/contracts/payment/escrow/Escrow.sol
index 14562e920..72da21b76 100644
--- a/contracts/payment/escrow/Escrow.sol
+++ b/contracts/payment/escrow/Escrow.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../../ownership/Secondary.sol";
diff --git a/contracts/payment/escrow/RefundEscrow.sol b/contracts/payment/escrow/RefundEscrow.sol
index 95e43ba3a..18d38f6bc 100644
--- a/contracts/payment/escrow/RefundEscrow.sol
+++ b/contracts/payment/escrow/RefundEscrow.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ConditionalEscrow.sol";
 
diff --git a/contracts/token/ERC20/ERC20.sol b/contracts/token/ERC20/ERC20.sol
index c767898e0..63c87d2f2 100644
--- a/contracts/token/ERC20/ERC20.sol
+++ b/contracts/token/ERC20/ERC20.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC20.sol";
 import "../../math/SafeMath.sol";
diff --git a/contracts/token/ERC20/ERC20Burnable.sol b/contracts/token/ERC20/ERC20Burnable.sol
index a71aaebc1..3345d3507 100644
--- a/contracts/token/ERC20/ERC20Burnable.sol
+++ b/contracts/token/ERC20/ERC20Burnable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC20.sol";
 
diff --git a/contracts/token/ERC20/ERC20Capped.sol b/contracts/token/ERC20/ERC20Capped.sol
index 9d44cf73b..f49300152 100644
--- a/contracts/token/ERC20/ERC20Capped.sol
+++ b/contracts/token/ERC20/ERC20Capped.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC20Mintable.sol";
 
diff --git a/contracts/token/ERC20/ERC20Detailed.sol b/contracts/token/ERC20/ERC20Detailed.sol
index 1606d4550..71c0b0159 100644
--- a/contracts/token/ERC20/ERC20Detailed.sol
+++ b/contracts/token/ERC20/ERC20Detailed.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC20.sol";
 
diff --git a/contracts/token/ERC20/ERC20Mintable.sol b/contracts/token/ERC20/ERC20Mintable.sol
index de9443309..e69df4605 100644
--- a/contracts/token/ERC20/ERC20Mintable.sol
+++ b/contracts/token/ERC20/ERC20Mintable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC20.sol";
 import "../../access/roles/MinterRole.sol";
diff --git a/contracts/token/ERC20/ERC20Pausable.sol b/contracts/token/ERC20/ERC20Pausable.sol
index 53b956ef9..3304cc033 100644
--- a/contracts/token/ERC20/ERC20Pausable.sol
+++ b/contracts/token/ERC20/ERC20Pausable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC20.sol";
 import "../../lifecycle/Pausable.sol";
diff --git a/contracts/token/ERC20/IERC20.sol b/contracts/token/ERC20/IERC20.sol
index 4bee8eb22..7c3230b96 100644
--- a/contracts/token/ERC20/IERC20.sol
+++ b/contracts/token/ERC20/IERC20.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC20 interface
diff --git a/contracts/token/ERC20/SafeERC20.sol b/contracts/token/ERC20/SafeERC20.sol
index 3c4e032a0..63378b71b 100644
--- a/contracts/token/ERC20/SafeERC20.sol
+++ b/contracts/token/ERC20/SafeERC20.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC20.sol";
 import "../../math/SafeMath.sol";
diff --git a/contracts/token/ERC20/TokenTimelock.sol b/contracts/token/ERC20/TokenTimelock.sol
index a03b75036..23dc2f9c3 100644
--- a/contracts/token/ERC20/TokenTimelock.sol
+++ b/contracts/token/ERC20/TokenTimelock.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./SafeERC20.sol";
 
diff --git a/contracts/token/ERC721/ERC721.sol b/contracts/token/ERC721/ERC721.sol
index 643d6706f..933a15c6d 100644
--- a/contracts/token/ERC721/ERC721.sol
+++ b/contracts/token/ERC721/ERC721.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC721.sol";
 import "./IERC721Receiver.sol";
diff --git a/contracts/token/ERC721/ERC721Burnable.sol b/contracts/token/ERC721/ERC721Burnable.sol
index 52291eef2..562a17e8e 100644
--- a/contracts/token/ERC721/ERC721Burnable.sol
+++ b/contracts/token/ERC721/ERC721Burnable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC721.sol";
 
diff --git a/contracts/token/ERC721/ERC721Enumerable.sol b/contracts/token/ERC721/ERC721Enumerable.sol
index 0ef5ea00f..ed987e3ab 100644
--- a/contracts/token/ERC721/ERC721Enumerable.sol
+++ b/contracts/token/ERC721/ERC721Enumerable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC721Enumerable.sol";
 import "./ERC721.sol";
diff --git a/contracts/token/ERC721/ERC721Full.sol b/contracts/token/ERC721/ERC721Full.sol
index 95ccff8df..308ea5265 100644
--- a/contracts/token/ERC721/ERC721Full.sol
+++ b/contracts/token/ERC721/ERC721Full.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC721.sol";
 import "./ERC721Enumerable.sol";
diff --git a/contracts/token/ERC721/ERC721Holder.sol b/contracts/token/ERC721/ERC721Holder.sol
index 87bebfa83..bcc10d7e2 100644
--- a/contracts/token/ERC721/ERC721Holder.sol
+++ b/contracts/token/ERC721/ERC721Holder.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC721Receiver.sol";
 
diff --git a/contracts/token/ERC721/ERC721Metadata.sol b/contracts/token/ERC721/ERC721Metadata.sol
index 685505ca3..ce263ddc7 100644
--- a/contracts/token/ERC721/ERC721Metadata.sol
+++ b/contracts/token/ERC721/ERC721Metadata.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC721.sol";
 import "./IERC721Metadata.sol";
diff --git a/contracts/token/ERC721/ERC721MetadataMintable.sol b/contracts/token/ERC721/ERC721MetadataMintable.sol
index b245f7c69..a1421d1dd 100644
--- a/contracts/token/ERC721/ERC721MetadataMintable.sol
+++ b/contracts/token/ERC721/ERC721MetadataMintable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC721Metadata.sol";
 import "../../access/roles/MinterRole.sol";
diff --git a/contracts/token/ERC721/ERC721Mintable.sol b/contracts/token/ERC721/ERC721Mintable.sol
index 8de0fc033..98cd7a3a8 100644
--- a/contracts/token/ERC721/ERC721Mintable.sol
+++ b/contracts/token/ERC721/ERC721Mintable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC721.sol";
 import "../../access/roles/MinterRole.sol";
diff --git a/contracts/token/ERC721/ERC721Pausable.sol b/contracts/token/ERC721/ERC721Pausable.sol
index 89ac5ca6a..7cfd39ae6 100644
--- a/contracts/token/ERC721/ERC721Pausable.sol
+++ b/contracts/token/ERC721/ERC721Pausable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./ERC721.sol";
 import "../../lifecycle/Pausable.sol";
diff --git a/contracts/token/ERC721/IERC721.sol b/contracts/token/ERC721/IERC721.sol
index 670a8dd07..afb94028c 100644
--- a/contracts/token/ERC721/IERC721.sol
+++ b/contracts/token/ERC721/IERC721.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../introspection/IERC165.sol";
 
diff --git a/contracts/token/ERC721/IERC721Enumerable.sol b/contracts/token/ERC721/IERC721Enumerable.sol
index ad34e77aa..4c1dfb564 100644
--- a/contracts/token/ERC721/IERC721Enumerable.sol
+++ b/contracts/token/ERC721/IERC721Enumerable.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC721.sol";
 
diff --git a/contracts/token/ERC721/IERC721Full.sol b/contracts/token/ERC721/IERC721Full.sol
index 2d15b964a..e543aefeb 100644
--- a/contracts/token/ERC721/IERC721Full.sol
+++ b/contracts/token/ERC721/IERC721Full.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC721.sol";
 import "./IERC721Enumerable.sol";
diff --git a/contracts/token/ERC721/IERC721Metadata.sol b/contracts/token/ERC721/IERC721Metadata.sol
index 77dc23914..05835aff8 100644
--- a/contracts/token/ERC721/IERC721Metadata.sol
+++ b/contracts/token/ERC721/IERC721Metadata.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC721.sol";
 
diff --git a/contracts/token/ERC721/IERC721Receiver.sol b/contracts/token/ERC721/IERC721Receiver.sol
index 4cd43a66b..b0618c0ec 100644
--- a/contracts/token/ERC721/IERC721Receiver.sol
+++ b/contracts/token/ERC721/IERC721Receiver.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC721 token receiver interface
diff --git a/contracts/utils/Address.sol b/contracts/utils/Address.sol
index 570b947cb..500467212 100644
--- a/contracts/utils/Address.sol
+++ b/contracts/utils/Address.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * Utility library of inline functions on addresses
diff --git a/contracts/utils/Arrays.sol b/contracts/utils/Arrays.sol
index 5337a5da9..1713faf1c 100644
--- a/contracts/utils/Arrays.sol
+++ b/contracts/utils/Arrays.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/Math.sol";
 
diff --git a/contracts/utils/ReentrancyGuard.sol b/contracts/utils/ReentrancyGuard.sol
index 19a2b6bc8..b7d2cb43f 100644
--- a/contracts/utils/ReentrancyGuard.sol
+++ b/contracts/utils/ReentrancyGuard.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Helps contracts guard against reentrancy attacks.